[GitHub] [pinot] richardstartin commented on a change in pull request #7454: bit-sliced index for int, long, float, double, dictionarized SV columns

[GitBox <gi...@apache.org>]

richardstartin commented on a change in pull request #7454:
URL: https://github.com/apache/pinot/pull/7454#discussion_r714065912



##########
File path: pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/creator/impl/inv/BitSlicedRangeIndexCreator.java
##########
@@ -0,0 +1,168 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pinot.segment.local.segment.creator.impl.inv;
+
+import java.io.File;
+import java.io.IOException;
+import org.apache.pinot.segment.spi.ColumnMetadata;
+import org.apache.pinot.segment.spi.index.creator.CombinedInvertedIndexCreator;
+import org.apache.pinot.spi.data.FieldSpec;
+import org.roaringbitmap.RangeBitmap;
+
+import static org.apache.pinot.segment.spi.V1Constants.Indexes.BITMAP_RANGE_INDEX_FILE_EXTENSION;
+import static org.apache.pinot.spi.data.FieldSpec.DataType.*;
+
+public class BitSlicedRangeIndexCreator implements CombinedInvertedIndexCreator {
+
+  public static final int RANGE_INDEX_VERSION = 2;
+
+  private final RangeBitmap.Appender _appender;
+  private final File _rangeIndexFile;
+  private final FieldSpec.DataType _valueType;
+  private final long _minValue;
+  private final double _scale;
+
+  public BitSlicedRangeIndexCreator(File indexDir, ColumnMetadata metadata) {
+    _appender = RangeBitmap.appender(maxValue(metadata));
+    _rangeIndexFile = new File(indexDir, metadata.getColumnName() + BITMAP_RANGE_INDEX_FILE_EXTENSION);
+    _valueType = metadata.getDataType();
+    _minValue = minValue(metadata);
+    _scale = scale(metadata);
+  }
+
+  @Override
+  public void add(int dictId) {
+    _appender.add(dictId - _minValue);
+  }
+
+  @Override
+  public void add(int[] dictIds, int length) {
+  }
+
+  @Override
+  public void add(long value) {
+    _appender.add(value - _minValue);
+  }
+
+  @Override
+  public void add(long[] values, int length) {
+  }
+
+  @Override
+  public void add(float value) {
+    if (!Float.isFinite(value)) {
+      // TODO this probably needs better handling, like using a 24th slice
+      //  for infinite values
+      _appender.add(0);
+    } else {
+      double d = value;
+      d -= Double.longBitsToDouble(_minValue);
+      d *= _scale;
+      _appender.add(Float.floatToIntBits((float) d));
+    }
+  }
+
+  @Override
+  public void add(float[] values, int length) {
+  }
+
+  @Override
+  public void add(double value) {
+    if (!Double.isFinite(value)) {
+      // TODO this probably needs better handling, like using a 57th slice
+      //  for infinite values
+      _appender.add(0L);
+    } else {
+      value -= Double.longBitsToDouble(_minValue);
+      value *= _scale;
+      _appender.add(Double.doubleToLongBits(value));
+    }
+  }
+
+  @Override
+  public void add(double[] values, int length) {
+  }
+
+  @Override
+  public void seal() throws IOException {
+    int headerSize = Integer.BYTES + Long.BYTES + (_valueType == FLOAT || _valueType == DOUBLE ? Double.BYTES : 0);
+    int serializedSize = _appender.serializedSizeInBytes();
+    try (MmapFileWriter writer = new MmapFileWriter(_rangeIndexFile, headerSize + serializedSize)) {
+      writer.write(buf -> {
+        buf.putInt(RANGE_INDEX_VERSION);
+        buf.putLong(_minValue);
+        if (_valueType == FLOAT || _valueType == DOUBLE) {
+          buf.putDouble(_scale);
+        }
+        _appender.serialize(buf);
+      });
+    }
+    _appender.clear();
+  }
+
+  @Override
+  public void close() throws IOException {
+
+  }
+
+  private static long maxValue(ColumnMetadata metadata) {
+    FieldSpec.DataType dataType = metadata.getDataType();
+    if (dataType == LONG || dataType == INT) {
+      Comparable<?> minValue = metadata.getMinValue();
+      Comparable<?> maxValue = metadata.getMaxValue();
+      if (minValue instanceof Number && maxValue instanceof Number) {
+        return ((Number) maxValue).longValue() - ((Number) minValue).longValue();
+      }
+    }
+    if (dataType == DOUBLE) {

Review comment:
       This is encapsulated in the class `FPOrdering` now.




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